To know what life is worth you have to risk it once in a while.
Commitment is an act, not a word.
The best work is not what is most difficult for you; it is what you do best.
Genius is what a man invents when he is looking for a way out.
There is a universe behind and before him. And the day is approaching when closing the last book on the last shelf on the far left; he will say to himself, "now what?
One cannot become a saint when one works sixteen hours a day.